Intestinal challenge with enterotoxigenic Escherichia coli in pigs, and nutritional intervention to prevent postweaning diarrhea
| Autor: | Sung Woo Kim, Yawang Sun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
medicine.drug_class medicine.medical_treatment Antibiotics Fimbria Biology medicine.disease_cause Microbiology 03 medical and health sciences Antibiotic resistance Food Animals Enterotoxigenic Escherichia coli medicine Feed additives lcsh:SF1-1100 Nutritional intervention Prebiotic 0402 animal and dairy science 04 agricultural and veterinary sciences Antimicrobial 040201 dairy & animal science Postweaning diarrhea Bacterial adhesin Diarrhea Special section: Nutrition and gut health in swine 030104 developmental biology Immunology Immunopropylaxis Animal Science and Zoology Pigs lcsh:Animal culture medicine.symptom |
| Zdroj: | Animal Nutrition Animal Nutrition, Vol 3, Iss 4, Pp 322-330 (2017) |
| ISSN: | 2405-6383 2405-6545 |
| Popis: | Gut health of nursery pigs immediately after weaning is tightly associated with their growth performance and economic values. Postweaning diarrhea (PWD) is one of the major concerns related to gut health of nursery pigs which often is caused by infections of enterotoxigenic Escherichia coli (ETEC), mainly including F4 (K88) + and F18 + E. coli. The main virulence factors of ETEC are adhesins (fimbriae or pili) and enterotoxins. The common types of fimbriae on ETEC from PWD pigs are F18 + and F4 + . Typically, PWD in pigs is associated with both F18 + and F4 + ETEC infections whereas pre-weaning diarrhea in pigs is associated with F4 + ETEC infection. Enterotoxins including heat-labile enterotoxins (LT) and heat-stable peptide toxins (ST) are associated with causing diarrhea in pigs. At least 10 9 to 10 10 ETEC are required to induce diarrhea in nursery pigs typically lasting 1 to 5 days after ETEC infection. Antibiotics used to be the most effective way to prevent PWD, however, with the increased bacterial resistance to antibiotics, alternatives to the use of antibiotics are urgently needed to prevent PWD. Immunopropylaxis and nutritional intervention of antimicrobial minerals (such as zinc oxide and copper sulfate), organic acids, functional feedstuffs (such as blood plasma and egg yolk antibodies), direct fed microbials, phytobiotics, and bacteriophage can potentially prevent PWD associated with ETEC. Some other feed additives such as nucleotides, feed enzymes, prebiotic oligosaccharides, and clay minerals can enhance intestinal health and thus indirectly help with preventing PWD. Numerous papers show that nutritional intervention using selected feed additives can effectively prevent PWD. |
| Databáze: | OpenAIRE |
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